Silencer deregulation has been removed from the big beautiful bill due to Byrd rule violations.

>Provisions Subject to a 60-Vote Byrd Rule Point of Order:
>Deregulation of gun silencers and easily concealable guns. This section removes the regulations pertaining to gun silencers and easily concealable firearms under the National Firearms Act. (Section 70436)
https://www.budget.senate.gov/ranking-member/newsroom/press/more-provisions-violate-byrd-rule-in-republicans-one-big-beautiful-bill